Effect of alpha-nucleus potential on the Al-27(alpha,t)Si-28 reaction - art. no. 044617

Full finite-range distorted-wave Born approximation calculations have been performed using molecular, Michel, and normal optical potentials to analyze the angular distributions of cross sections for the 53 transitions populat ing the bound and unbound states of Si-28 via the (alpha,t) reaction. The p arameters of these three potentials have been determined from analyses of t he elastic scattering data in the entrance channel at the incident energy i nvolved. The molecular and optical potentials are found to produce satisfac tory fits to the data, but the Michel potential seems to be inadequate. For all three potentials in the entrance channel, the deduced l transfers for the transitions to the 15.02, 15.85, and 16.11 MeV states differ from the a ssignments previously reported. The extracted spectroscopic factors are com pared with shell-model predictions. [S0556-2813(99)02510-8].